MECUM DART?

SSing said

Never seen this yellow sticker before. Next to the fender tag.
Car was said to be so very original. Maybe it is, so what does it say?
Also radiator is new to me, or did Chrysler have a couple different rads to choose from?
Last pic the BB radiator you usually found when delivered from Hurst.
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To build a clone today, what choices do I have for a radiator besides finding an original and having it recored ???
Or if I was just a building a nice 68 with a hemi crossram and not worrying about radiator numbers, are there other 68 BB style radiators that would fit and work ?
I’d like to know what’s in that yellow car,
any idea ???